Description of problem:

During installation of undercloud for OSP8 and/or OSP9 using:
> openstack undercloud install
it fails on nova-api
> Error: Could not start Service[nova-api]: Execution of '/bin/systemctl start openstack-nova-api' returned 1: Job for openstack-nova-api.service failed because a timeout was exceeded. See "systemctl status openstack-nova-api.service" and "journalctl -xe" for details.

in nova.log exception show failure of sudo nova-rootwrap:
> 2018-10-11 13:55:47.710 4825 DEBUG oslo_concurrency.processutils [-] u'sudo nova-rootwrap /etc/nova/rootwrap.conf iptables-save -c' failed. Not Retrying. execute /usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py:375
> 2018-10-11 13:55:47.711 4825 DEBUG oslo_concurrency.lockutils [-] Lock "iptables" released by "nova.network.linux_net._apply" :: held 3.790s inner /usr/lib/python2.7/site-packages/oslo_concurrency/lockutils.py:265
> 2018-10-11 13:55:47.713 4825 CRITICAL nova [-] ProcessExecutionError: Unexpected error while running command.
> Command: sudo nova-rootwrap /etc/nova/rootwrap.conf iptables-save -c
> Exit code: 1
> Stdout: u''
> Stderr: u'sudo: PAM account management error: Authentication service cannot retrieve authentication info\n'
> 2018-10-11 13:55:47.713 4825 ERROR nova Traceback (most recent call last):
> 2018-10-11 13:55:47.713 4825 ERROR nova   File "/usr/bin/nova-api", line 10, in <module>
> 2018-10-11 13:55:47.713 4825 ERROR nova     sys.exit(main())
> ...
> 2018-10-11 13:55:47.713 4825 ERROR nova   File "/usr/lib/python2.7/site-packages/nova/utils.py", line 272, in execute
> 2018-10-11 13:55:47.713 4825 ERROR nova     return processutils.execute(*cmd, **kwargs)
> 2018-10-11 13:55:47.713 4825 ERROR nova   File "/usr/lib/python2.7/site-packages/oslo_concurrency/processutils.py", line 342, in execute
> 2018-10-11 13:55:47.713 4825 ERROR nova     cmd=sanitized_cmd)
> 2018-10-11 13:55:47.713 4825 ERROR nova ProcessExecutionError: Unexpected error while running command.
> 2018-10-11 13:55:47.713 4825 ERROR nova Command: sudo nova-rootwrap /etc/nova/rootwrap.conf iptables-save -c
> 2018-10-11 13:55:47.713 4825 ERROR nova Exit code: 1
> 2018-10-11 13:55:47.713 4825 ERROR nova Stdout: u''
> 2018-10-11 13:55:47.713 4825 ERROR nova Stderr: u'sudo: PAM account management error: Authentication service cannot retrieve authentication info\n'

in audit.log is visible about 65 entries like:
> type=AVC msg=audit(1539280257.488:1159): avc:  denied  { execute } for  pid=1782 comm="sudo" name="unix_chkpwd" dev="vda1" ino=4531529 scontext=system_u:system_r:nova_t:s0 tcontext=system_u:object_r:chkpwd_exec_t:s0 tclass=file permissive=0


Version-Release number of selected component (if applicable):
this happens on two osp versions, OSP8:
> openstack-selinux.noarch         0.8.14-15.el7ost       @rhelosp-8.0-puddle
> selinux-policy.noarch            3.13.1-229.el7         @rhelosp-rhel-7.6-server
and in case of OSP9:
> openstack-selinux.noarch             0.8.14-15.el7ost   @rhelosp-9.0-puddle     
> selinux-policy.noarch                3.13.1-229.el7     @rhelosp-rhel-7.6-server


How reproducible:
always

Steps to Reproduce:
1. on rhel-7.6 machine add RHOSP-8 repositories
2. install python-tripleoclient
3. openstack undercloud install

Actual results:
it fails, and in output there is error about systemctl start nova-api failed

Expected results:
undercloud installation succeeded without errors